A couple of recently deceased ghosts contract the services of a "bio-exorcist" in order to remove the obnoxious new owners of their house.

1.
Lydia: Well, I've read through that handbook for the recently deceased. It says: 'live people ignore the strange and unusual. I, myself, am strange and unusual.

2.
Adam: What are your qualifications?
Beetlejuice: Ah. Well… I attended Juilliard… I'm a graduate of the Harvard business school. I travel quite extensively. I lived through the Black Plague and had a pretty good time during that. I've seen the EXORCIST ABOUT A HUNDRED AND SIXTY-SEVEN TIMES, AND IT KEEPS GETTING FUNNIER EVERY SINGLE TIME I SEE IT… NOT TO MENTION THE FACT THAT YOU'RE TALKING TO A DEAD GUY… NOW WHAT DO YOU THINK? You think I'm qualified?